/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/MeshNormals.h
Compute per-vertex normals for the vertices of a set of triangles of a Mesh
static void QuickComputeVertexNormalsForTriangles ( [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) & Mesh, const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & Triangles, bool bWeightByArea, bool bWeightByAngle, bool bInvert )